Permatex High Strength Threadlocker Red - 27100 is a high strength, permanent threadlocker that is designed to secure and seal threaded fasteners to prevent loosening due to vibration. It is ideal for use on fasteners up to 3/4 (19mm) in diameter and provides a temperature range of -65°F to 300°F (-54°C to 149°C). It is also resistant to most shop fluids and features a low-odor formula.